Set channel as bound when accepting channel open request

Signed-off-by: Meng Tan <mtan@wallix.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

src/messages.c

@@ -1161,6 +1161,7 @@ int ssh_message_channel_request_open_reply_accept_channel(ssh_message msg, ssh_c
     chan->remote_maxpacket = msg->channel_request_open.packet_size;
     chan->remote_window = msg->channel_request_open.window;
     chan->state = SSH_CHANNEL_STATE_OPEN;
+    chan->flags &= ~SSH_CHANNEL_FLAG_NOT_BOUND;
 
     rc = ssh_buffer_pack(session->out_buffer,
                          "bdddd",